Once again, that is the bank rate. That meaning the XE or other converter site rates. It doesn't mean that's what the banks pay out. It's what the bank gets when they exchange $$$. Maybe interbank rate would be a better term. When you take your US$ to a bank or cambio & get J$ in exchange, you will get slightly LESS than the bank rate. This is how they make their money & can offer their service to you. I hope this helps. I guess it never hurts to explain it again :-)
I will also add, as have many others, DO NOT exchange from the guy hanging out in the parking lot. He makes his $$$ by ripping you off.